11
Donaldson Company, Inc.
Problem
Probable Cause
Remedy
NEMA Control Box with Starter, Pulse Control and Phothelic Gauge
Pulse cleaning does not
operate with the selector
switch in the ON position
Defective wiring
Check wiring to solenoid valves.
Defective solenoid valves
Check solenoid coils and replace as necessary.
Timer control board not energized
Check supply voltage to timer board. Check the timer
board's fuse. Replace with one of equal value. If supply
voltage and fuse are good, observe the control board. The
outlet LED indicates if the control board is attempting to
pulse. LED's flash to indicate power to solenoid. Check
output with an analog volt meter using the 150-Volt AC
scale. The needle deflects if voltage is present when LED
flashes. If LED's do not flash or no voltage is present,
replace the timer board.
Pulse cleaning does not
operate with the selector
switch in the GAUGE
position
Defective wiring
Check wiring to solenoid valves.
Defective solenoid valves
Check solenoid coils and replace as necessary.
Timer control board not energized
Check supply voltage to timer board. Check the timer
board's fuse. Replace with one of equal value. If supply
voltage and fuse are good, observe the control board. The
outlet LED indicates if the control board is attempting to
pulse. LED's flash to indicate power to solenoid. Check
output with an analog volt meter using the 150-Volt AC
scale. The needle deflects if voltage is present when LED
flashes. If LED's do not flash or no voltage is present,
replace the timer board.
Defective Photohelic air lines
Check tubing and fittings for leaks or obstructions.
Defective Photohelic gauge
Use a voltmeter and the wiring diagram to check for power
at Terminals L1 and L2. If power is present, move setpoint
indicators below gauge pressure reading. If pulsing does
not begin when pressure exceeds the high setpoint,
replace the gauge. If power is not present at Terminals L1
and L2, check the CR1 relay function.
Troubleshooting
